Watch movement



March 5, 1940. A. BULOVA WATCH MOVEMENT 2 Sheets-Sheet 1 Filed Feb. 25, 1937 March 5, 1940. A. BULOVA WATCH MOVEMENT Filed Feb. 23, 1937 2 Sheets-Sheet 2 Patented Mar. 5, 1940' UNITED STATES PATENT. OFFICE Application February 23, 1937, Serial No. 127,249 In Switzerland November 12, 1936 2 Claims.

The present invention relates to a watch movement.

Watches are known already having inwardly curved watch cases which assume to some ex tent the form of the wrist. In such watches the dial must also be curved to suit the form of the case, because without this feature the effect of the curving would be entirely lost.

Such curved dials mustof course be fastened somehow to the pillar plate and to this end watches have been proposed having several plates at different levels and the attaching points of the dial were chosen on these plates so as to fall into the curvature of the dial. Such structure however becomes too complicated and too expensive as compared to other Watches on the market.

The present invention avoids these difficulties by using a separate dial rest plate covering the dial train and having its upper surface curved according to the curvature of the dial. The remainder of the movement may then be arranged in the usual way as in watches where the contact surfaces between the pillar plate and the cocks are perpendicular to the staffs of the movement. In certain watches the dial support-plate is cut out for leaving free space for the feet of the dial and for the axis of the second-hands.

One working form is shown of a movement according to the invention in the annexed drawings in which Figure l is a top plan view of the improved watch movement, the dial being removed to expose the dial rest plate and the securing means therefor.

Fig. 2 is a view showing the case in section and the movement in side elevation.

Fig. 3 is a longitudinal section along the longitudinal axis of the movement and Fig. 4 is a diagram showing the arrangement of the wheels.

To the bottom surface of the pillar plate a of the movement shown in Fig. 1 are attached the usual cocks, but represented only in part, the contact faces of which with the plate are all perpendicular to the axis of the hands of the watch. b denotes a plane formed by the upper surface of the pillar plate, said plate supporting a dial-rest plate 0 which covers a sinking a in the upper surface of the pillar plate containing the minute train and is fastened to the pillar plate a by means of two screws 01 and c This dial-rest platehas two notches f and gto lay bare the holes hand 2' provided for the feet of the dial. The notch k: leaves a passage for the axis 1 of the second-hand. The upper curvature of this plate corresponds to that of the chamfering m--n at the ends of the pillar plate a, so that the whole forms a support on which the dial 0 having its feet 0 engaged in the holes 71., i in the usual way may rest.

In Figs. 3 and 4, as an example, the arrangement of parts is shown. case, r the bezel and s the glass. The dial 0 rests partly on the chamfered borders m-n of the plate and partly on the separate dial r-est plate 0, which, resting on the plate a at the plane b, covers a sinking enclosing thedial work.

The center wheel 1; mounted on the center staff u meshes as in ordinary. movements with the pinion of the third wheelv which meshes with the pinion of the fourth wheel w on the seconds staff 2 located on the longitudinal axis of the watch. Moved by the fourth wheel is the escape wheel :0 combined with the balance wheel 1 near the side border of the watch case. The left hand side of the case contains the barrel p meshing with the pinion of the center wheel. A cock supporting the center and second{ staffs is denoted with a.

What I claim is:

1. In a watch a minute train, a center staff, a straight pillar plate having a sinking and cocks having their contact surfaces arranged perpendicularly to the center staff, a curved dial proa is the plate, q the vided with feet, fastening the same to the pillar 35 plate, a separate central dial rest platescrewed to the pillar plate and having a curved surface to correspond to the curvature of the dial and forming a cover for the minute train arranged in the sinking of the pillar plate, a watch case receiving the pillar plate, the curved dial and the dial rest plate and being provided with a curved bottom and a bezel, and a glass mounted in the bezel.

2. A watch movement according to claim 1, in 45 which said pillar plate has chamfered edges serving as additional rests for said dial.

ARDE BULOVA. 

